Splitwise

Splitwise is an expense-sharing and bill-splitting service that helps roommates, travel groups, couples, and friends track shared costs and settle up fairly. Its public Self-Serve REST API (v3.0) lets third-party applications read and manage a user's groups, friends, expenses, comments, and notifications on that user's behalf, authenticating with OAuth 2.0 or a personal API key. Splitwise was added to the API Evangelist network from a venture-capital portfolio lead and has been enriched from its public developer documentation and OpenAPI specification.

Splitwise publishes 7 APIs on the APIs.io network, including comments API, expenses API, friends API, and 4 more. Tagged areas include Company, Consumer, Expense Management, Personal Finance, and Bill Splitting.

Splitwise’s developer surface includes authentication, documentation, API reference, signup flow, engineering blog, and 20 more developer resources.

🌐 Visit website 📡 Source on GitHub
50.4/100 developing ▬ flat Agent 58/100 agent ready Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
7 APIs 1 MCP Servers
CompanyConsumerExpense ManagementPersonal FinanceBill SplittingPaymentsREST APIOAuth

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 50.4/100 · developing
Contract Quality 12.8 / 25
Developer Ergonomics 10.4 / 20
Commercial Clarity 6.8 / 20
Operational Transparency 3.4 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 58/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 3 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/splitwise: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 7

Individual APIs this provider publishes, each with its own machine-readable definition.

Splitwise comments API

The comments API from Splitwise — 3 operation(s) for comments.

Splitwise expenses API

The expenses API from Splitwise — 6 operation(s) for expenses.

Splitwise friends API

The friends API from Splitwise — 5 operation(s) for friends.

Splitwise groups API

A Group represents a collection of users who share expenses together. For example, some users use a Group to aggregate expenses related to a home. Others use it to represent a t...

Splitwise notifications API

The notifications API from Splitwise — 1 operation(s) for notifications.

Splitwise other API

The other API from Splitwise — 2 operation(s) for other.

Splitwise users API

Resources to access and modify user information.

Scroll for all 7

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

splitwise-mcp.yml

MCP SERVER

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Splitwise Authentication

http/oauth2 · 2 schemes

SECURITY

Splitwise Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Splitwise Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Splitwise Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 AgentSkill
AgentSkill
 WellKnown
WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 DataModel
DataModel
 Conformance
Conformance
 Lifecycle
Lifecycle

Build 1

SDKs, sample code, and the tooling you integrate with

Packages
Packages

Access & Security 6

Authentication, authorization, and security posture

Authentication
Authentication
 OAuthScopes
OAuthScopes
 SecurityTxt
SecurityTxt
 VulnerabilityDisclosure
VulnerabilityDisclosure
 Security
Security
 DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

StatusPage
StatusPage

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Blog
Blog
 Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: splitwise
name: Splitwise
description: Splitwise is an expense-sharing and bill-splitting service that helps roommates, travel groups, couples, and
  friends track shared costs and settle up fairly. Its public Self-Serve REST API (v3.0) lets third-party applications read
  and manage a user's groups, friends, expenses, comments, and notifications on that user's behalf, authenticating with OAuth
  2.0 or a personal API key. Splitwise was added to the API Evangelist network from a venture-capital portfolio lead and has
  been enriched from its public developer documentation and OpenAPI specification.
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://www.splitwise.com/assets/press/logos/sw.svg
url: https://raw.githubusercontent.com/api-evangelist/splitwise/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- bullpen-capital
- insight-partners
- matrix-partners
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Consumer
- Expense Management
- Personal Finance
- Bill Splitting
- Payments
- REST API
- OAuth
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- aid: splitwise:splitwise-comments-api
  name: Splitwise comments API
  description: The comments API from Splitwise — 3 operation(s) for comments.
  humanURL: https://dev.splitwise.com/
  baseURL: https://secure.splitwise.com/api/v3.0
  tags:
  - comments
  properties:
  - type: OpenAPI
    url: openapi/splitwise-comments-api-openapi.yml
  - type: Conventions
    url: conventions/splitwise-conventions.yml
  - type: ErrorCatalog
    url: errors/splitwise-problem-types.yml
  - type: DataModel
    url: data-model/splitwise-data-model.yml
- aid: splitwise:splitwise-expenses-api
  name: Splitwise expenses API
  description: The expenses API from Splitwise — 6 operation(s) for expenses.
  humanURL: https://dev.splitwise.com/
  baseURL: https://secure.splitwise.com/api/v3.0
  tags:
  - expenses
  properties:
  - type: OpenAPI
    url: openapi/splitwise-expenses-api-openapi.yml
  - type: Conventions
    url: conventions/splitwise-conventions.yml
  - type: ErrorCatalog
    url: errors/splitwise-problem-types.yml
  - type: DataModel
    url: data-model/splitwise-data-model.yml
- aid: splitwise:splitwise-friends-api
  name: Splitwise friends API
  description: The friends API from Splitwise — 5 operation(s) for friends.
  humanURL: https://dev.splitwise.com/
  baseURL: https://secure.splitwise.com/api/v3.0
  tags:
  - friends
  properties:
  - type: OpenAPI
    url: openapi/splitwise-friends-api-openapi.yml
  - type: Conventions
    url: conventions/splitwise-conventions.yml
  - type: ErrorCatalog
    url: errors/splitwise-problem-types.yml
  - type: DataModel
    url: data-model/splitwise-data-model.yml
- aid: splitwise:splitwise-groups-api
  name: Splitwise groups API
  description: A Group represents a collection of users who share expenses together. For example, some users use a Group to
    aggregate expenses related to a home. Others use it to represent a trip. Expenses assigned to a group are split among
    the users of that group. Importantly, two users in a Group can also have expenses with one another outside of the Group.
  humanURL: https://dev.splitwise.com/
  baseURL: https://secure.splitwise.com/api/v3.0
  tags:
  - groups
  properties:
  - type: OpenAPI
    url: openapi/splitwise-groups-api-openapi.yml
  - type: Conventions
    url: conventions/splitwise-conventions.yml
  - type: ErrorCatalog
    url: errors/splitwise-problem-types.yml
  - type: DataModel
    url: data-model/splitwise-data-model.yml
- aid: splitwise:splitwise-notifications-api
  name: Splitwise notifications API
  description: The notifications API from Splitwise — 1 operation(s) for notifications.
  humanURL: https://dev.splitwise.com/
  baseURL: https://secure.splitwise.com/api/v3.0
  tags:
  - notifications
  properties:
  - type: OpenAPI
    url: openapi/splitwise-notifications-api-openapi.yml
  - type: Conventions
    url: conventions/splitwise-conventions.yml
  - type: ErrorCatalog
    url: errors/splitwise-problem-types.yml
  - type: DataModel
    url: data-model/splitwise-data-model.yml
- aid: splitwise:splitwise-other-api
  name: Splitwise other API
  description: The other API from Splitwise — 2 operation(s) for other.
  humanURL: https://dev.splitwise.com/
  baseURL: https://secure.splitwise.com/api/v3.0
  tags:
  - other
  properties:
  - type: OpenAPI
    url: openapi/splitwise-other-api-openapi.yml
  - type: Conventions
    url: conventions/splitwise-conventions.yml
  - type: ErrorCatalog
    url: errors/splitwise-problem-types.yml
  - type: DataModel
    url: data-model/splitwise-data-model.yml
- aid: splitwise:splitwise-users-api
  name: Splitwise users API
  description: Resources to access and modify user information.
  humanURL: https://dev.splitwise.com/
  baseURL: https://secure.splitwise.com/api/v3.0
  tags:
  - users
  properties:
  - type: OpenAPI
    url: openapi/splitwise-users-api-openapi.yml
  - type: Conventions
    url: conventions/splitwise-conventions.yml
  - type: ErrorCatalog
    url: errors/splitwise-problem-types.yml
  - type: DataModel
    url: data-model/splitwise-data-model.yml
common:
- type: Authentication
  url: authentication/splitwise-authentication.yml
- type: OAuthScopes
  url: scopes/splitwise-scopes.yml
- type: Conventions
  url: conventions/splitwise-conventions.yml
- type: ErrorCatalog
  url: errors/splitwise-problem-types.yml
- type: DataModel
  url: data-model/splitwise-data-model.yml
- type: Conformance
  url: conformance/splitwise-conformance.yml
- type: Lifecycle
  url: lifecycle/splitwise-lifecycle.yml
- type: StatusPage
  url: https://status.splitwise.com/
- type: Packages
  url: packages/splitwise-packages.yml
- type: MCPServer
  url: mcp/splitwise-mcp.yml
- type: LLMsTxt
  url: llms/splitwise-llms.txt
- type: AgentSkill
  url: skills/_index.yml
- type: WellKnown
  url: well-known/splitwise-well-known.yml
- type: SecurityTxt
  url: well-known/splitwise-security.txt
- type: VulnerabilityDisclosure
  url: security/splitwise-vulnerability-disclosure.yml
- type: Security
  url: security/splitwise-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/splitwise-domain-security.yml
- type: DeveloperPortal
  url: https://dev.splitwise.com/
- type: Documentation
  url: https://dev.splitwise.com/
- type: APIReference
  url: https://dev.splitwise.com/
- type: SignUp
  url: https://secure.splitwise.com/apps
- type: Blog
  url: https://blog.splitwise.com/
- type: TermsOfService
  url: https://www.splitwise.com/terms
- type: PrivacyPolicy
  url: https://www.splitwise.com/privacy
- type: Website
  url: https://www.splitwise.com
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 15
  pass: local-v1